Well I 100% support Minato and think he deserves better. Sure Minato isn't perfect and has his problems, but the person who brings trouble to their relationship right now is Shizuma.
Because he cares more about his boss, than about his boyfriend and in the end he makes it look as if it's normal to eat sweets etc. with his boss, making Minato wait for no good reason, while letting Minato think he's at fault being insecure and jealous.
Seriously, I'm not a jealous person, but if my boyfriend says he's late because of work, but in fact he was late because he ate sweets with his boss and even went shopping, it's time for a fight
Onodera go to hell with your jealousy and leave my baby Minato alone! And Minato, don't be too easy on Shizuma, that man seriously has to stop mixing work and private life and being to nice to everyone he meets!
Plus even if they solve things now, I bet Shizuma will find out that Onodera is a man, but keeps it from Minato, Minato will find out later asking Shizuma if he knew and why he didn't tell him. Shizuma will come up with some stupid nice guy reasons, and poor Minato will blame himself again, even though he didn't do anything wrong